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X18

Sensibly equivalent to:
1AC6 1C2
    
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The X18 is a battery heptode frequency changer or mixer. It was designed for AM broadcast radio reception on the short, medium and long wave bands.
The oscillator feed needs to 15 volts pk-pk.
The thin glass tube envelope is 20 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Datasheet.

 

Pin Connections
B7G
1
2
3
4
5
6
7
f(-)
a
g2
g1
g4
g3
f(+),g5

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.4
0.05
90
67.5
0.0
1.15
2.85
0.6M
0.32
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 18, 2013.
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